There is a context-free language L0 such that every context-flee language is an inverse homomorphic image of Lo or Lo {e}. Hence the time complexity of recognition of Lo is the least upper bound for time complexity of recognition of context-free languages. A similar result holds for quasirealtime Tu
The hardest linear conjunctive language
โ Scribed by Alexander Okhotin
- Book ID
- 104136927
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 190 KB
- Volume
- 86
- Category
- Article
- ISSN
- 0020-0190
No coin nor oath required. For personal study only.
โฆ Synopsis
This paper demonstrates that the P-complete language of yes-instances of Circuit Value Problem under a suitable encoding can be generated by a linear conjunctive grammar, or, equivalently, accepted by a triangular trellis automaton. This result has several implications on the properties of the languages generated by conjunctive grammars of the general form and on the relationship between the abstract models of parallel computation.
๐ SIMILAR VOLUMES
Linear conjunctive grammars are conjunctive grammars in which the body of each conjunct contains no more than a single nonterminal symbol. They can at the same time be thought of as a special case of conjunctive grammars and as a generalization of linear context-free grammars that provides an explic